Improvement in grinding-ivsills



s. (3.. RO'LLINS. lmprovemelnt in Grinding-MUIS.

, c HA WITNESSES I-NVENTOH ,im Mg? ATEN'I OFFICE.

SAMUEL G. ROLLINS, OF BOSTON, MASSAGHUSFTTS.

IMPROVEMENT iN GRiNDlNG-MILLS.

Specification forming part of Letters Patent No. dated August 20, 1872;

. To all whom 'it may concern:

The Nature of the Invcntfioa.

Description of the Accompanying Draw/ing.

Figure l represents a vertical section through the center of my mill. The plan being circular, requires no drawing. Fig. 2 is a vertical section through the lower oil-cup and step.

General Dcscw'pticu.

Let A represent the upper or iixed stone, which may be adjusted by the screws s s s s. B is the lower or running stone, and is supported on the shaft O, in the usual manner. l) is the driving-pulley attached to the shaft O. E is a step made as hereinafter described, and resting lupon the adjusting-lever F. This adjusting-lever F may be raised or lowered by the hand-wheel H, which operates through the screw-bolt G. The casin g of my mill is made as shown in the drawing, and consists of the upper easing L M L' M', the top disk M M', the oiler K, the side casing N O N' O', and the lower ilange O l? O' P'. This casing is provided with two openings or doors, Q Q',

through which the operator may lool; when adjusting the stones. The oil-box Kis cast into the upper plate M M', and is provided with a tube, lo, and a wick, T, so that the' journal will be provided with oil as long as there is any in the cup K. The step of the spindle O is made as shown in Fig. 2.- The recess in the upper part of the step E is made much larger than the end of the spindle O, so V that the recess may contain a quantity of oil, and also afford a firm bearing for the spindle. The lateral bearing for the spindle is furnished by the tube k, so that the step E acts only as a vertical lsupport for the spindle, and as an oil-cup.

The advantages'of my device are, first, the foot of the shaft rests in and upon a step that is independent of the oil-cup and housing that gives the lateral support, and consequently any wearing of the step does not affect the true running of the stone. The step being cup-shaped, as shown in Fig. 2, serves to catch the drip of the oil-cup that furnishes oil for the lateral bearing. Second, the upper housing of the shaft O, together with the oil-cup, is cast into the upper plate, and hence requires no extra tting and adjustment.

I claim as my inventionl. lThe housing L M N O P and oil-cup E, when the same are cast together and iu one piece, as and for the purpose described.I

2. The combination and arrangement of the foot of shaft C, tube la, and step E, as and for the purpose set forth.

SAMUEL G. ROLLINS. 

